Abstract
The author has made some experiment of making commercial ingots at a certain factory for more than ten years since Taisho-10(1921), in view of lightening the segregation inside of most heavy-sectioned ingots. The first experiment of the method of water-cooling moulds had proved to be unsuccessful for the heavy-sectioned ingots.
Then the author devised a mould-rotating apparatus, with which various methcds of centrifugal casting were experimented; the result being as follows:-
The continuous +otation in the same direction from the beginning of casting to the point of soli dification indicated no influence on the mode of segregation. However, the reversal or intermittent rotation proved remarkably to lessen the ring gohst zone at the top of ingots. Therefore, it was known that such kind of rotation may accelerate the tendency of-impurities to be driven into the core from outside or to float upwards from below during the solidification of ingots.
